package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

@Service
@RequiredArgsConstructor
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    private final WeChatProperties weChatProperties;
    private final UserMapper userMapper;


    /**
     * 微信用户登录
     * @param userLongDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        //用户微信接口服务， 获取当前微信用户的openid
        Map<String, String> map = new HashMap<>();

        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", "authorization_code");


        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        //返回值为json
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");

        //判断openid是否为空， 为空则抛异常
        if(openid == null) {

            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);

        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);

        //如果是新用户， 自动完成注册
        if(user == null) {

            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();

            userMapper.insert(user);

        }

        //返回该用户对象
        return user;

    }
}
